A high-precision rotation measurement method based on digital photogrammetry technology

Abstract

The invention provides a high-precision rotation measurement method based on a digital photography measurement technology. The high-precision rotation measurement method comprises the following stepsof respectively pasting reflecting target labels on a rotor and a stator, wherein the numbers of the reflecting target labels on the stator and the rotor are respectively Ns and Nr, and the Ns and Nrare positive integers; shooting the reflecting target labels on a rotary frame under the condition that a rotation is not generated initially, and solving a three-dimensional coordinates of all the reflecting target labels according to the shot photos after the shooting is finished; rotating the rotor of the rotary frame to Na set of angles to be measured, shooting and solving the three-dimensional coordinates to obtain three-dimensional coordinates of each reflecting target label under each angle to be measured; fitting and calculating the relative rotation angle of the rotor relative to thestator under the condition of given rotation instruction according to the three-dimensional coordinates (shown in the description) of each reflecting target label obtained in the second and third steps.

Description

technical field [0001] The invention belongs to the field of image information technology processing, and in particular relates to a high-precision rotation measurement method based on digital photogrammetry technology. Background technique [0002] Modern astronomical telescopes have increasingly high requirements for pointing accuracy. In the field of radio, the typical value of the main beam width of large radio astronomy telescopes (such as FAST telescope, Delingha 13.7-meter-aperture millimeter-wave telescope, etc.) is 10-50 arc seconds. In order to ensure observation efficiency, the pointing accuracy of the telescope is usually required to reach × On the order of 1 arc second. [0003] The telescope pointing error usually includes a systematic part and a random part. The systematic part can be corrected by the pointing model, and the residual error after correction is mainly a random pointing error. This part of the error is mainly determined by the repeated positioni...

AI Technical Summary

Problems solved by technology

[0007] The measurement accuracy of the pendulum instrument is high, and can reach an angular resolution of 1 arc second or even higher, but its disadvantage is that it needs to be used with a laser interferometer

In addition, the pendulum instrument can only measure the rotation angle in the plane, and cannot realize the measurement of the rotation angle on the axis of any direction in the three-dimensional space

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